Calibrating Refractometer

[Madreefer]

What are you people using for sloution to recalibrate your refractormeters?

[wayner]

Pinpoint Calibration Fluid 53.0 mS

The only thing I'll ever used

[SteveCGY]

Originally Posted by wayner

Pinpoint Calibration Fluid 53.0 mS

The only thing I'll ever used

Where can I get this in the south? I'm in cranston

[wayner]

Pinpoint Calibration Fluid 53.0 mS

The only thing I'll ever use

[gregzz4]

Any brand with 35ppt is good enough for me
I follow the 45 seconds instructions with my ATC

[jason604]

I just use 0ppm rodi water. Dunno if that's the right thing to do but hey it's working n free!!! Lol

[seasalt_newbies]

what 45 sec instructions are you talking about ?

[gregzz4]

Originally Posted by seasalt_newbies

what 45 sec instructions are you talking about ?

I have a bottle of Aqua Craft Products, and it states to "Place a few drops of Refractometer Calibration Solution on refractometer prism slide.
Allow 45 seconds if ATC refractometer is used."

My refractometer instructions state this time delay allows the solution to adjust to the ambient temp of the unit. But my unit and solution are kept in the same room - whatever
My instructions also state to cal the unit at 68F. Something to do with it being an ATC unit. Then it is accurate with an ambient shift of 10-30C
So I cal my unit in the basement as it's cooler down there than my 74F upstairs
To each his/her own ...

[ashr]

Originally Posted by jason604

I just use 0ppm rodi water. Dunno if that's the right thing to do but hey it's working n free!!! Lol

This is what I do.. I hope it works haha

[Stones]

Originally Posted by jason604

I just use 0ppm rodi water. Dunno if that's the right thing to do but hey it's working n free!!! Lol

I used to do this as well but it is much better to calibrate with a known 35 ppt solution such as the pinpoint one listed above.

Using 0 ppm RODI water to calibrate my refractometer, my salinity was acutally at 1.028 when the refractometer was reading 1.025. Didn't know this until after I had used the pinpoint solution to calibrate.